The video was released during an FBI press conference providing more details about the shooting. Officials said Alexis acted alone and was mentally unstable. He did not appear to be targeting any specific individuals.

The video is embedded below. It appears to have to have been edited to exclude any violence:

The FBI also released photos of the gun Alexis used for the shooting. Police found bizarre engravings on the weapon.

FBI

FBI

FBI

Alexis reportedly believed he was being influenced by low-frequency electromagnetic waves, according to officials at the press conference. He served in the Navy between 2007 and 2011 and had legitimate access to the Navy Yard facility.